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Lockheed Martin's Skunk Works is developing an unmanned hypersonic strike aircraft called the SR-72 that's designed to travel at six times the speed of
sound—twice the speed of the company's famed SR-71 Blackbird surveillance
airplane, announced the company, Nov. 1, 2013. The SR-72 could be operational
by 2030, according to the company. Here, artists' renderings of the SR-72.